In general, flat rack containers will only have walls at the front and the back, but none on the sides. They enable the safe transport of particularly bulky items such as heavy machinery or special components. Additional support is provided by support posts and the floor is made of particularly resilient material.
Open top containers do not have a firm cover attached on top – they remain open at the top or are covered with a tarpaulin. These containers are also used to transport particularly bulky freight.
Aside from the shape of the goods, open top containers also come with advantages for loading, as the open-top design allows cargo to be picked up from above using a crane.